Summary: Unfortunately, it’s the last Megan Man Zero. The whole "must have an A on the last mission to get the boss' ability" is gone. Now, you have a weather system that can change the weather in the stage into one of two different conditions. One is significantly easier, but you don't get the boss' ability. Best to set it to that on return trips. The Recoil Rod has been replaced, AGAIN! (Didn't see that coming did you?) The new weapon is the Zero Knuckle.
Summary: A definite improvement over the secomd one. The chain weapon has been replaced with a "Recoil Rod" that can strike in any direction. This is the third different weapon for that slot in as many games. The Recoil Rod is definitely the best weapon for that slot yet. When fired straight down when standing still it can be used to propel you up higher than you can jump. The Cyber Elf system has changed.
Summary: This game is not awesome at all, but it's fine. I think the most in this game is everuthing about making chips (try to get some search in internet in order to look which parts made the right chip for Zero). It's highly recommended but I hope the number 5 is comming soon.